diff --git a/Agent.md b/Agent.md
index b9d35970..06f2f11d 100644
--- a/Agent.md
+++ b/Agent.md
@@ -121,7 +121,7 @@ pkill -f "emrg.server"; rm -f ~/.emrg/emrgd.token; python -m emrg
 
 Python: `uv run pytest tests/ -v` (1107) — import check: `uv run python -c "from emrg.client.app import run_client"`
 GUI: `cd emrg/gui && npm test` (265: 45 daemon_client + 20 conn-manager + 22 app-commands + 132 renderer smoke + 15 i18n + 8 integration + 3 commands + 8 build-config + 7 gui-state + 2 tool-group + 3 preload-api) — syntax: `node --check main.js preload.js daemon_client.js renderer/js/*.js`
-Renderer: `cd emrg/gui/renderer && npm run typecheck && npm test` (354: 5 snapshot-store + 9 utils + 3 ErrorBoundary + 2 App smoke + 11 commands + 4 copywriting + 11 i18n + 11 markdown + 15 transcript + 7 TranscriptView + 15 history + 22 composer + 14 Composer + 12 sidebar + 10 Sidebar + 9 fileTree + 9 FileTree + 16 resultPanel + 8 ResultPanel + 27 workspaceView + 8 WorkspaceView + 10 dialog + 6 Dialog + 9 ConfirmDialog + 9 RenameDialog + 10 dialogLists + 3 HelpDialog + 9 MemoryDialog + 6 SkillsDialog + 9 openSession + 6 WelcomeDialog + 8 OpenSessionDialog + 7 NewSessionDialog + 7 rewind + 8 RewindDialog + 7 GithubDeviceDialog + 12 daemonBridge) + `npm run build` → `renderer/dist/`
+Renderer: `cd emrg/gui/renderer && npm run typecheck && npm test` (360: 5 snapshot-store + 9 utils + 3 ErrorBoundary + 2 App smoke + 11 commands + 4 copywriting + 11 i18n + 11 markdown + 15 transcript + 7 TranscriptView + 15 history + 22 composer + 14 Composer + 12 sidebar + 10 Sidebar + 9 fileTree + 9 FileTree + 16 resultPanel + 8 ResultPanel + 27 workspaceView + 8 WorkspaceView + 10 dialog + 6 Dialog + 9 ConfirmDialog + 9 RenameDialog + 10 dialogLists + 3 HelpDialog + 9 MemoryDialog + 6 SkillsDialog + 9 openSession + 6 WelcomeDialog + 8 OpenSessionDialog + 7 NewSessionDialog + 7 rewind + 8 RewindDialog + 7 GithubDeviceDialog + 12 daemonBridge + 6 DaemonBridgeProvider) + `npm run build` → `renderer/dist/`
 CI: `uv run pytest` (ubuntu + **windows-2025 matrix** — Windows pytest 回归在 PR CI 即失败，v0.2.29 教训 #725) + GUI tests + **actionlint workflow lint** (`rhysd/actionlint@v1.7.12` gate, #444 — workflow 解析错误在 PR CI 即失败，如 `if:` secrets 上下文)
 Re-trigger: `scripts/re-trigger-ci.sh [branch]` (workflow_dispatch, #527 — 替代空 commit 重触发：Actions outage 会整段丢弃 push 事件，dispatch 走 API 路径不受影响)
 Git-over-https 兜底: `python scripts/sync-master-from-api.py [--repo owner/name] [--ref master]` — 受限网络下 github.com:443 不可达而 api.github.com 可达时，用 Git Data API 的 verification payload + signature 字节级重建上游 commit（含 web-flow GPG 签名 squash merge，reconstruct_commit 经 hermetic 测试验证 sha 一致）并推进本地 refs；内容对象缺失时 fail-loud 提示改用 git fetch（10+ 周期实证的恢复路径）
diff --git a/emrg/gui/renderer/src/App.tsx b/emrg/gui/renderer/src/App.tsx
index 8fe163d8..599b1670 100644
--- a/emrg/gui/renderer/src/App.tsx
+++ b/emrg/gui/renderer/src/App.tsx
@@ -1,15 +1,17 @@
 import { ErrorBoundary } from "./components/ErrorBoundary";
 import { Shell } from "./components/Shell";
+import { DaemonBridgeProvider } from "./components/DaemonBridgeProvider";
 import { I18nProvider } from "./lib/i18n";
 
 /**
- * App — React 组件树根（Batch 0 骨架）。
+ * App — React 组件树根（Batch 0 骨架 + Batch 5 slice 2 daemon-event context）。
  *
  * 组件树与设计文档 §4.1 对齐：
  *   <App>
  *   └── <ErrorBoundary>          # 全局错误边界（React 版，替代 error-boundary.js）
- *       └── <AppProviders>       # i18n / theme / daemon-event context（本期：i18n）
- *           └── <Layout>         # 本期为 <Shell> 占位
+ *       └── <AppProviders>       # i18n / theme / daemon-event context
+ *           └── <DaemonBridgeProvider>   # Batch 5 slice 2：daemon 事件桥 + 聊天状态机
+ *               └── <Layout>     # 本期为 <Shell> 占位
  *
  * 后续批次将 Shell 逐步替换为 Sidebar / TranscriptView / ResultPanel / Dialogs；
  * 旧 vanilla renderer（js/*.js）保持不动直到 Batch 5 一次性切换（设计 D3）。
@@ -18,7 +20,9 @@ export function App() {
   return (
     <ErrorBoundary>
       <I18nProvider>
-        <Shell />
+        <DaemonBridgeProvider>
+          <Shell />
+        </DaemonBridgeProvider>
       </I18nProvider>
     </ErrorBoundary>
   );
diff --git a/emrg/gui/renderer/src/components/DaemonBridgeProvider.test.tsx b/emrg/gui/renderer/src/components/DaemonBridgeProvider.test.tsx
new file mode 100644
index 00000000..83de93a0
--- /dev/null
+++ b/emrg/gui/renderer/src/components/DaemonBridgeProvider.test.tsx
@@ -0,0 +1,123 @@
+import { afterEach, describe, expect, it, vi } from "vitest";
+import { render, screen, waitFor } from "@testing-library/react";
+import { useSyncExternalStore } from "react";
+import type { ReactNode } from "react";
+import { DaemonBridgeProvider, useDaemonBridge } from "./DaemonBridgeProvider";
+import { ErrorBoundary } from "./ErrorBoundary";
+import { I18nProvider } from "../lib/i18n";
+import { useSnapshotStore } from "../hooks/useSnapshotStore";
+import type { DaemonEventFrame } from "../lib/daemonBridge";
+
+/**
+ * DaemonBridgeProvider.test.tsx — Batch 5 slice 2：AppProviders daemon-event
+ * context 层测试。模拟 preload 的 window.emrg（ipcRenderer.on 多订阅者语义）：
+ * 验证订阅创建、事件端到端路由进共享 TranscriptStore、卸载取消订阅、
+ * window.emrg 缺失降级、Provider 外 useDaemonBridge 抛错。
+ */
+
+/** 模拟 preload 暴露的 window.emrg（多订阅者通道，与 ipcRenderer.on 语义一致） */
+function mockEmrg() {
+  const listeners = new Set<(evt: DaemonEventFrame) => void>();
+  const onEvent = vi.fn((cb: (evt: DaemonEventFrame) => void) => {
+    listeners.add(cb);
+    return () => listeners.delete(cb);
+  });
+  const sendMessage = vi.fn().mockResolvedValue({ requestId: "req-9" });
+  (window as unknown as { emrg?: unknown }).emrg = { onEvent, sendMessage };
+  return {
+    listeners,
+    onEvent,
+    sendMessage,
+    emit: (evt: DaemonEventFrame) => listeners.forEach((cb) => cb(evt)),
+  };
+}
+
+function wrapper(children: ReactNode) {
+  return (
+    <I18nProvider lang="en">
+      <DaemonBridgeProvider>{children}</DaemonBridgeProvider>
+    </I18nProvider>
+  );
+}
+
+describe("DaemonBridgeProvider (Batch 5 slice 2)", () => {
+  afterEach(() => {
+    delete (window as unknown as { emrg?: unknown }).emrg;
+  });
+
+  it("在 effect 中创建桥并订阅 window.emrg.onEvent", async () => {
+    const m = mockEmrg();
+    render(wrapper(<div data-testid="child" />));
+    await waitFor(() => expect(screen.getByTestId("child")).toBeInTheDocument());
+    expect(m.onEvent).toHaveBeenCalledTimes(1);
+  });
+
+  it("把 daemon 事件端到端路由进共享 TranscriptStore（message_delta 双帧拼接）", async () => {
+    const m = mockEmrg();
+    let text = "";
+    function Probe() {
+      const { transcript } = useDaemonBridge();
+      // 与 TranscriptView 相同的订阅方式：store 版本号变更触发重渲染
+      useSyncExternalStore(transcript.subscribe, transcript.getVersion);
+      text = transcript
+        .getEntries("s1")
+        .map((e) => (e.kind === "assistant" ? e.segments.map((s) => s.text).join("") : e.kind))
+        .join(",");
+      return <div />;
+    }
+    render(wrapper(<Probe />));
+    await waitFor(() => expect(m.onEvent).toHaveBeenCalledTimes(1));
+    m.emit({ type: "message_delta", data: { chunks: [{ request_id: "r1", content: "Hel" }] }, sid: "s1" });
+    m.emit({ type: "message_delta", data: { chunks: [{ request_id: "r1", content: "lo" }] }, sid: "s1" });
+    await waitFor(() => expect(text).toContain("Hello"));
+  });
+
+  it("sessions 事件更新桥 store（Shell 侧边栏数据源）", async () => {
+    const m = mockEmrg();
+    let openSessions = 0;
+    function Probe() {
+      const { bridge } = useDaemonBridge();
+      // 与 Shell 相同的订阅方式：bridge.store 快照订阅
+      const appState = useSnapshotStore(bridge.store);
+      openSessions = appState.openSessions.length;
+      return <div />;
+    }
+    render(wrapper(<Probe />));
+    await waitFor(() => expect(m.onEvent).toHaveBeenCalledTimes(1));
+    m.emit({ type: "open_sessions", data: { openSessions: [{ sid: "s1", projectName: "p" }] }, sid: null });
+    await waitFor(() => expect(openSessions).toBe(1));
+  });
+
+  it("window.emrg 缺失时优雅降级（不抛错，子组件可挂载）", async () => {
+    render(
+      <DaemonBridgeProvider>
+        <div data-testid="child" />
+      </DaemonBridgeProvider>,
+    );
+    await waitFor(() => expect(screen.getByTestId("child")).toBeInTheDocument());
+  });
+
+  it("Provider 之外 useDaemonBridge 抛错（被 ErrorBoundary 捕获）", () => {
+    const errSpy = vi.spyOn(console, "error").mockImplementation(() => {});
+    function Bad() {
+      useDaemonBridge();
+      return null;
+    }
+    const { container } = render(
+      <ErrorBoundary>
+        <Bad />
+      </ErrorBoundary>,
+    );
+    expect(container.querySelector(".error-boundary-overlay")).toBeInTheDocument();
+    errSpy.mockRestore();
+  });
+
+  it("卸载时 dispose（取消订阅，listener 清空）", async () => {
+    const m = mockEmrg();
+    const { unmount } = render(wrapper(<div />));
+    await waitFor(() => expect(m.onEvent).toHaveBeenCalledTimes(1));
+    expect(m.listeners.size).toBe(1);
+    unmount();
+    expect(m.listeners.size).toBe(0);
+  });
+});
diff --git a/emrg/gui/renderer/src/components/DaemonBridgeProvider.tsx b/emrg/gui/renderer/src/components/DaemonBridgeProvider.tsx
new file mode 100644
index 00000000..a112b03a
--- /dev/null
+++ b/emrg/gui/renderer/src/components/DaemonBridgeProvider.tsx
@@ -0,0 +1,81 @@
+import { createContext, useContext, useEffect, useRef, useState, type ReactNode } from "react";
+import {
+  createDaemonBridge,
+  type DaemonBridge,
+  type DaemonEventFrame,
+  type SendMessagePayload,
+} from "../lib/daemonBridge";
+import { createTranscriptStore, type TranscriptStore } from "../lib/transcript";
+import { useI18n, type TranslateFn } from "../lib/i18n";
+
+/**
+ * DaemonBridgeProvider — Batch 5 slice 2：daemon-event context 层（设计文档 §4.1
+ * AppProviders）。PR #1016 的 lib/daemonBridge.ts 是纯逻辑地基；本组件把它接进
+ * React 树：
+ *
+ * - 创建 TranscriptStore（聊天区状态机，与 TranscriptView 共享同一实例）和
+ *   DaemonBridge（订阅 window.emrg.onEvent，发送走 window.emrg.sendMessage）。
+ * - context 暴露 { bridge, transcript }；`useDaemonBridge()` 消费（Shell 及后续
+ *   slice 的组件用它取会话列表 / 连接状态 / 聊天状态机）。
+ * - 桥在 effect 中创建：StrictMode dev 双挂载时 dispose 清理第一次订阅（无泄漏），
+ *   生产构建 StrictMode 为 no-op，单次挂载；value 就绪前一帧渲染 null。
+ * - 非 Electron 环境（window.emrg 缺失）优雅降级：onEvent 返回 no-op 取消函数、
+ *   sendMessage 以传入 requestId resolve —— 浏览器预览 / 单测不崩溃，store 可用。
+ */
+
+export interface DaemonBridgeContextValue {
+  bridge: DaemonBridge;
+  transcript: TranscriptStore;
+}
+
+const DaemonBridgeContext = createContext<DaemonBridgeContextValue | null>(null);
+
+/** preload.js 暴露的 window.emrg 最小形状（仅本组件用到的两个通道） */
+interface EmrgWindow {
+  emrg?: {
+    onEvent?: (cb: (evt: DaemonEventFrame) => void) => () => void;
+    sendMessage?: (p: SendMessagePayload) => Promise<{ requestId?: string }>;
+  };
+}
+
+export function DaemonBridgeProvider({ children }: { children: ReactNode }) {
+  const { t } = useI18n();
+  // t 每次渲染可能是新函数对象（无 I18nProvider 时 useI18n 回退路径每帧新建），
+  // 若把 t 放进 effect deps 会无限重建桥（事件处理时翻译需取最新 t）→ 用 ref 桥接：
+  // 桥只在挂载时创建一次（deps []），翻译始终委托给 tRef.current（最新词典）。
+  const tRef = useRef(t);
+  tRef.current = t;
+  const [value, setValue] = useState<DaemonBridgeContextValue | null>(null);
+
+  useEffect(() => {
+    const tt: TranslateFn = (key, params) => tRef.current(key, params);
+    const transcript = createTranscriptStore({ t: tt });
+    const bridge = createDaemonBridge({
+      onEvent: (cb) => {
+        const emrg = (window as unknown as EmrgWindow).emrg;
+        return emrg?.onEvent ? emrg.onEvent(cb) : () => {};
+      },
+      emrg: {
+        sendMessage: async (p) => {
+          const emrg = (window as unknown as EmrgWindow).emrg;
+          if (!emrg?.sendMessage) return { requestId: p.requestId };
+          return emrg.sendMessage(p);
+        },
+      },
+      transcript,
+      t: tt,
+    });
+    setValue({ bridge, transcript });
+    return () => bridge.dispose();
+  }, []);
+
+  if (!value) return null;
+  return <DaemonBridgeContext.Provider value={value}>{children}</DaemonBridgeContext.Provider>;
+}
+
+/** 消费 hook：返回 { bridge, transcript }；Provider 之外调用抛错（接线错误快速暴露） */
+export function useDaemonBridge(): DaemonBridgeContextValue {
+  const ctx = useContext(DaemonBridgeContext);
+  if (!ctx) throw new Error("useDaemonBridge must be used within DaemonBridgeProvider");
+  return ctx;
+}
diff --git a/emrg/gui/renderer/src/components/Shell.tsx b/emrg/gui/renderer/src/components/Shell.tsx
index 6c2270e3..7bb9e784 100644
--- a/emrg/gui/renderer/src/components/Shell.tsx
+++ b/emrg/gui/renderer/src/components/Shell.tsx
@@ -1,4 +1,6 @@
 import { useI18n } from "../lib/i18n";
+import { useSnapshotStore } from "../hooks/useSnapshotStore";
+import { useDaemonBridge } from "./DaemonBridgeProvider";
 import { Sidebar } from "./Sidebar";
 import { ResultPanel } from "./ResultPanel";
 import { WorkspaceView } from "./WorkspaceView";
@@ -6,11 +8,15 @@ import { WorkspaceView } from "./WorkspaceView";
 /**
  * Shell — React 骨架占位布局（Batch 0 + Batch 3 Sidebar/ResultPanel 挂载）。
  * 设计文档 §5 Batch 0 项 4：错误边界/横幅/菜单等零风险组件先就位。
- * Batch 3：左侧挂载 <Sidebar> + 右侧挂载 <ResultPanel>（当前空数据，Batch 5 接线 daemon 事件）。
+ * Batch 3：左侧挂载 <Sidebar> + 右侧挂载 <ResultPanel>（当前空数据）。
+ * Batch 5 slice 2：接入 DaemonBridgeProvider —— 侧边栏实时消费 daemon 广播的
+ * 会话列表（open_sessions / sessions 事件驱动，bridge.store 快照订阅）。
  * 后续批次逐个替换为真实组件：TranscriptView / Dialogs。
  */
 export function Shell() {
   const { t } = useI18n();
+  const { bridge } = useDaemonBridge();
+  const appState = useSnapshotStore(bridge.store);
   return (
     <div className="react-shell" data-testid="react-shell">
       <header className="react-shell-header">
@@ -21,7 +27,7 @@ export function Shell() {
       </header>
       <div className="react-shell-body">
         <aside className="react-shell-sidebar" data-testid="react-shell-sidebar">
-          <Sidebar openSessions={[]} />
+          <Sidebar openSessions={appState.openSessions} knownSessions={appState.sessions} />
         </aside>
         <main className="react-shell-main">
           <WorkspaceView activeView="projects" />